The Trizol reagent is sometimes used in this procedure, and one reagent in this procedure sometimes has isoamyl alcohol added. A common alternative to this procedure is performed using a silica-gel spin column sold by QIAgen. The products of this procedure are considered pure if the ratio of absorption at 260 nanometers and 280 nanometers is greater than 1.8. Guanidinium thiocyanate is sometimes used as a chaotrope in this procedure, which uses a reagent that is sold in a stabilizer to prevent its conversion to (*) phosgene. It may be preceded 
The Trizol reagent is sometimes used in this procedure, and one reagent in this procedure sometimes has isoamyl alcohol added. A common alternative to this procedure is performed using a silica-gel spin column sold by QIAgen. The products of this procedure are considered pure if the ratio of absorption at 260 nanometers and 280 nanometers is greater than 1.8. Guanidinium thiocyanate is sometimes used as a chaotrope in this procedure, which uses a reagent that is sold in a stabilizer to prevent its conversion to (*) phosgene. It may be preceded by a digestion of the sample with proteinase K. An ethanol precipitation usually follows this procedure. For 10 points, name this method that uses two namesake chemicals to partition nucleic acid from protein in a solution.
The Trizol reagent is sometimes used in this procedure, and one reagent in this procedure sometimes has isoamyl alcohol added.
{Phenol}-{chloroform extraction}